Patch Testing

Skin rashes can be painful, irritating and lead to skin infections in some cases. A patch test can be specifically helpful with identifying the triggers which causes the skin rash. Patch testing to specific chemicals, metals and other substances determines if the patient has a delayed hypersensitivity reaction to the substance.

Patch tests don’t use needles. Instead, allergens are applied to patches, which are applied to the skin of the back.

These can include latex, medications, fragrances, preservatives, hair dyes, metals and resins.

Potential reactions are evaluated in the office at 48 hours and 72 hours after application of the test substance.

During this time, you should avoid bathing and activities that cause heavy sweating. The patches are removed when you return to your doctor’s office. Irritated skin at the patch site may indicate an allergy.